Currently, there is no scientific justification for improving the geometric parameters of the laser saw and the accuracy standards of functional parameters. The issue of improving the geometric parameters of the saw is important and, in this regard, requires urgent resolution. The article deals with the issues related to the choice of optimal parameters of the laser saw. Sh. Imomkulov | X. Isaxanov | Z. Abdukahhorov "Results Research on the Choice of Optimal Parameters of the Laser Saw" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-5 , August 2020, URL: https://www.ijtsrd.com/papers/ijtsrd33069.pdf Paper Url :https://www.ijtsrd.com/other-scientific-research-area/other/33069/results-research-on-the-choice-of-optimal-parameters-of-the-laser-saw/sh-imomkulov
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The main feature of our tests was to conduct them in
production conditions [4].
Saw blades with a diameter of 312 mm with different
thicknesses at the tops of the teeth were prepared in five
versions of 100 saws each (Fig.1).
Fig 1 Diagrams of the tooth of a Genie saw with different thickness at the top
e-I variant-saw blades had teeth of thickness at the top = 0.2-0.3 mm, i.e. both sides of the tooth were chamfered on abrasives.
Option II-when e= 0.4-0.5 mm, the chamfer is removed from both sides of the tooth.
Option III-when e= 0.6-0.7 mm, the chamfer is removed slightly from both sides of the tooth.
IV option-at e= 0,8-0,9 mm, only burrs were removed from the exit side of the punch
V option - at 0.95 > e > 0.9, i.e. the teeth after crossing were not processed for chamfering or Burr removal, only grinding was
carried out in sand baths according to the existing operating instructions for the equipment of the saw shop.
The saw blades of the I-IV variants were also sanded under different conditions, in a sand bath according to the existing
instructions.
The saw blades of each variant were separately mounted on specific shafts for a separate gin battery. Thus, each gin was
completed with saws of a certain variant, after which all gins were adjusted the same way.
3. Results and Discussion
Tests were carried out under the same conditions and different modes of ginning. All ginsworked mainly on the fourth power
tooth, which corresponded to a performance of 9-10 kg of fiber per saw per hour. The pressure in the air chamber was
maintained equal to 180-140 water column. The test duration for variants II, III and IVwas 48 hours, andfor variantsIandVit
was 4 hours. The reason for the short duration of the I and V variants was a noticeable deterioration in the quality of the fiber
and seeds due to an increase in the density of the raw roller and poor removal of fiber from the teeth, especially in the V
variant. In the II, III and IV variants, the ginning process proceeded normally and the fiber was also consumed normally.
To assess the technological properties of fiber and seeds, the plant's laboratories took samplesunderourcontrolandaccording
to the developed methodology.
Fiber samples were taken from the neck of each gin for each variant, and seed samples were taken from the seed trays of each
gin. The samples taken were taken three times per shift, i.e. for the II, III and IV variants 18 times, and for the I and V-3 times.
Technological analyses were carried out in the laboratory of the plant according to the existing rules.
At the time of sampling, the current strength in the phases of the electric motor of the gin saw cylinder was also measured.
For clarity, the results are presented as graphs 1-5.
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1 graph Depending on the amount of fiber defects on the thickness of the tops of the teeth
2 graph Dependences of the seed crushing on the thickness of the tooth tops
3 graph The dependence of the omission of the seed on the thickness of the tops of the teeth
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4 graph The dependence of the residual fibrous content of the seed on the thickness of the tops of the teeth
5 graph The dependence of the current strength of one phase of the gin motor on the thickness of the tops of the
teeth
Graph 1 shows that as the thickness of the tooth vertexes
increases, the number of defects in the fiber decreases,
which is mainly due to a decrease in the broken seed in the
fiber. At the same time the content of litter and cotton in the
fiber almost does not change
The explanation that the increase in thickness at the top of
the tooth causes a decrease in the amount of defects in the
fiber, apparently, is that the specific pressure of the edge of
the tooth on the fiber and seeds decreases and this was
accompanied by a decrease in the damage of the latter. In
contrast to the General pattern, the amount of fiber defects
on the V version of the saw had an inflated value.
Thiscan be explained by the fact that the saw blades of theV
variant did not undergo chamfering after the tooth was re-
cut; only the teeth were ground in a sand bath under
different conditions with other options for preparing the
saws [5]. Apparently, such an identical condition for
processing the teeth for all variants is not sufficient for theV
variant, and the teeth of the V variant are obviously not free
from invisible burrs. Thus, the number of burrs on the teeth
of the V variant was greater than on the teeth of the I and IV
variants. And in the industry, it has long been knownthatthe
presence of burrs leads to a deterioration in the quality of
products [6].
Graph 2 shows that the change in the crushed seed occurs
inversely proportional to the change in thickness at the tops
of the tooth. The reasons for thisare also found inthechange
in the specific pressure on the seeds from the edge of the
tooth.
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From graph 3, it can be seen that the change in the full
omitted seed occurs in the opposite proportiontothechange
in the thickness of the tooth vertexes.
4. Conclusion
Researchers Levkovich B. A., Rakhimov N. M. found that an
increase in the thickness at the top of the tooth causes an
intensification of the intervene process [7].
It is possible that in the process of ginning occur and
processes partial intervene. If we assume this, then in our
case, the increase in thickness at the top of the tooth also
caused an intensification of the linting process during
ginning. Therefore, an increase in the thickness at the top of
the tooth caused a decrease in the full pubescence of the
seeds.
Graph 4 shows that the residual fiber content of the seed’s
changesin inverse proportion to the change in the thickness
of the tooth apex. The explanation for this is the same as in
figure 3.
Finally, graph 5 shows that the law of changing the load on
the motor of the gin saw cylinder relative to the change in
tooth thickness proceeds according to the law of direct
proportion [8].
The explanation of the latter is thatwhen the thicknessatthe
top of the tooth increases, the degree of its contact with the
mass of the raw roller increases and this causes an increase
in the load on the gin shaft.
Thus, according to the results of the test, we come to the
conclusion that the rational thickness at the top of the saw
tooth is equal to e=0.8±0.1 mm, at which it is possible to
obtain products of the proper quality.
5. References
[1] Fedorov V. S. Technology of primary processing of raw
cotton, Gilegprom. 1937
[2] Levkovich B. A. Elements of the ginning theory. The
state publishing house Uz SSR. Tashkent, 1938
[3] Saidov, Kh. On the rational profile of the Genie saw
tooth, New technology Magazine. GITH UzSSR by co-
Ordin. n / a works no. 3. 1962 Pages 22-24.
[4] Levkovich B. A. Rational profile of the tooth of a fiber-
separating saw. Collection of TTI, no. 12, 1961
[5] Akhmedova S. About the tooth profile of a fiber-
separating and fluff-separating saw. Collection of TTI,
No. 6, 1958
[6] khamov M. G. Grinding the teeth of saw sections with
powdered abrasive material in a sand bath / / Ref. SB.
Cotton industry. - Tashkent, 1991. - No. 5.- 14-16 p.
[7] Sh. Imomqulov, Z. Abduqahhorov, “Influence to
Optimization Geometric Parameter Saws on His (Its)
Capacity to Work”. International Journal of Recent
Technology and Engineering (IJRTE). Volume-9 Issue-
1, May 2020. 1749-1753 p.
[8] Sh. Imomqulov, Z. Abduqahhorov, “Improvement
Geometric Parameter Saws And Increasing His(Its)
Capacity ToWork”International JournalofEngineering
and Technology (IJET). Vol 12 No 3 May-Jun2020.503-
507 p.